Quantifying the dynamics of flow within a permeable bed using time-resolved endoscopic particle imaging velocimetry (EPIV)
Quantifying the dynamics of flow within a permeable bed using time-resolved endoscopic particle imaging velocimetry (EPIV)
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DOI：
10.1007/s00348-011-1198-8
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发表时间：
2012-07
影响因子：
2.4
通讯作者：
G. Blois;G. S. Sambrook Smith;J. Best;R. Hardy;J. Lead
中科院分区：
文献类型：
--
作者：
G. Blois;G. S. Sambrook Smith;J. Best;R. Hardy;J. Lead
本文介绍了一项实验研究的结果，该实验研究了自由表面流动覆盖的充填床孔隙空间内流动的平均值和时间演变。通过内窥镜PIV （EPIV）技术收集数据。EPIV允许以高时空分辨率量化孔隙空间内的瞬时速度场，从而允许研究高雷诺数自由流（Resin范围9.8 × 103-9.7 × 104）产生的湍流地下流动的结构。孔空间内相干流结构的演化是由射流驱动的，射流与孔流的相互作用产生了不同的相干流结构。研究了自由流水深、雷诺数和弗劳德数的影响。
This paper presents results of an experimental study investigating the mean and temporal evolution of flow within the pore space of a packed bed overlain by a free-surface flow. Data were collected by an endoscopic PIV (EPIV) technique. EPIV allows the instantaneous velocity field within the pore space to be quantified at a high spatio-temporal resolution, thus permitting investigation of the structure of turbulent subsurface flow produced by a high Reynolds number freestream flow (Resin the range 9.8 × 103–9.7 × 104). Evolution of coherent flow structures within the pore space is shown to be driven by jet flow, with the interaction of this jet with the pore flow generating distinct coherent flow structures. The effects of freestream water depth, Reynolds and Froude numbers are investigated.